Hii, I have brought a jiofi few months ago, the product is average because it does not satisfy its price. just for 4g use we have to spent 2000+ rs. there is a space for memory card but no one know what is the use of it. its main disadvantage is you cant use other sim like airtel, voda etc. battery also not that much stable.5-6 hours you can enjoy battery life. its main advantage is you can talk through this just by installing jio4g voice app. I am giving 3 star because of less battery life . but product is good for internet user who doesnot have 4g handset.